Annealing device for paper-making machines and the like.



R. H. ROGERS. ANNBALING DEVICE FOR PAPER'MAKING MACHINES AND THE LIKE.

APPLICATION FILED PEB.5, 1910.

Patgnted June-27, 1911.

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ROBERT H. ROGERS, OF SCI-IENECTADY, NEW YORK, ASSIGNOR T0 GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented June 2'7, 1911.

Application filed February 5, 1910. Serial No. 542,313.

To all whom it may concern:

Be it known that I, ROBERT H. Roenns, a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Annealing Devices forPaper-Making Machines and the Like, of which the following is aspecification.

This invention relates to improvements in paper making machines and thelike and has for its object to prolong the life of one of the essentialparts of machines of this character.

In paper-making machines there is commonly employed a metallic endlessscreen upon which the pulp is carried, drained and pressed into form. Inthe Fourdrinier machine, for instance, there is employed a wire clothformed into an endless belt. These belts are made from very fine wire.The mesh. is exceedingly fine and it is generally woven. Furthermore,the belt has considerable length and width and is therefore quiteexpensive. These wire cloths or screens are usually made of brass orsimilar material which has the property of hardening by continuousbending. When one of these wire cloths, therefore, has been used for anyconsiderable length of time the metal becomes hard due to the bendingover the rollers. The result is that in practice it frequently happensthat the screen tears and becomes useless in a very few weeks.

It is the object of my invention to so organize a machine of thecharacter above referred to that'the cause of breakage may beneutralized and the life of the wire prolonged. To this end I employ aheater arranged in the path of travel of the screen so that the screenmay be quickly and uniformly heated during its travel. Adjacent theheater I provide means for cooling the screen when it leaves the heater,thereby annealing the brass so as to render it soft and pliable. Inorder to provide a very efficient and uniform heat in a simple manner, Ihave employed an electric heater arranged underneath the screen at onepoint and extending its entire width and a spray of Water is thenarranged to be projected upon the screen, after it leaves the heater, tosuddenly cool it.

In the accompanying drawings embodying one form of my invention, Figure1 represents a paper making machine having my invention applied theretoand Fig. 2 is a fragmentary view of the belt showing the transformer forheating the same.

Referring to the drawings, 10 represents a portion of the frame of apaper making machine. The type of machine which I have shown is thewell-known Fourdrinier machine, which illustrates the features necessarytoan understanding of my invention. The essential feature of this partof the machine is the endless wire cloth screen or conveyer 11 whichpasses over the large end rollers 12 and 13 and over a series ofintermediate supporting and tightening rollers 14, 15, 16, 17, etc. Theupper side of the belt runs upon a series of parallel rollers 18 whichare very close together. This latter portion of the belt receives thepulp and forms it into paper in thewell-known manner, the belt travelingin the direction of the arrows. Arranged underneath the lower side ofthe belt is a heating device, which, for purposes of illustration, Ihave shown as a transformer 19, extending the entire width of thescreen. The secondary of this transformer is arranged to be of theshort-cireuited type, the screen itself forming a portion of thesecondary. I11 other words, the secondary has a U-shaped core mounted sothat the screen will travel over the faces 20 so that it will completethe short circuit. It

will be seen that as soon as suitable current is applied to thistransformer the screen will be heated as it passes over the core.Moreover, the heat will be uniform throughout the width of the screen sothat the delicate wires of the Wire cloth will not be in danger ofoverheating. In order to cool the screen quickly so as to properlyanneal it, I have provided suitable means for applying a cooling fluidthereto. This cooling means consists of a water pipe 21 arranged tosprinkle the water over the screen. This heater and cooling device maybe connected permanently in place on the machine so that at in tervals,say, for instance, two or three times a week, the screen may beannealed. In order to do this, it will simply be necessary to turn onthe current and the water and start the machine.

It will be seen that I have provided a very simple and efficient meansfor annealing a screen of the character described, and, while I haveshown my invention embodied in concrete form for purposes ofillustration, it should be understood that this arrangement is merelytypical, since various modifications of the means and mechanisms foraccomplishing the result Will suggestthemselves to those skilled in theart Without departing from the spirit of my invention, the scope ofWhich is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. A paper making machine comprising a frame, an endless metallic screenmounted thereon, an electric heater mounted adjacentthe screen forheating the same, and a cooling device located adjacent to the heaterfor cooling the screen.

2. A paper making machine comprising a frame, an endless metallic screenmounted thereon, a transformer having a short circuited secondarymounted adjacent said screen and extending throughout the Width thereof,and a cooling device located in proximity to the transformer for coolingthe screen.

In Witness whereof, I have hereunto set my hand this 4th day ofFebruary, 1910.

ROBERT H. ROGERS.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

